@book{ref1,
    author = {Author Name},
    title = {Book Title},
    publisher = {Publisher Name},
    year = {2023}
}

@article{ref2,
    author = {Author Name},
    title = {Article Title},
    journal = {Journal Name},
    year = {2023},
    volume = {10},
    pages = {1-10}
}

@online{ref3,
    author = {Author Name},
    title = {Web Page Title},
    url = {https://example.com},
    year = {2023}
}